Question: What is the mouth of the watercourse of Mississippi River at Mississippi River Delta?
Paraphrase: Where is the mouth of the watercourse of Mississippi River at the Mississippi River Delta?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q1497 p:P403 ?s . ?s ps:P403 ?obj . ?s pq:P805 wd:Q1528035 }